Proceedings ArticleDOI
Measurements of reflection characteristics and refractive indices of interior construction materials in millimeter-wave bands
K. Sato,Hideki Kozima,H. Masuzawa,Takeshi Manabe,Toshio Ihara,Y. Kasashima,K. Yamaki +6 more
- Vol. 1, pp 449-453
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TLDR
The authors measured the reflection characteristics of materials with inhomogeneous structures or rough surfaces, and found that the specular reflection from a concrete plate and a floorboard can be reduced significantly by covering them with carpet tiles with rough surfaces.Abstract:
The reflection characteristics and refractive indices of construction materials in the millimeter wave bands are needed for development of millimeter-wave application systems such as indoor communication systems and short-range sensing systems. Because so little experimental data of construction materials at millimeter-wave bands has been available, the authors have measured the reflection and transmission coefficients of a concrete plate, plasterboard, rock wool, a floorboard, a carpet tile, at 57.5, 78.5, and 95.9 GHz. The refractive indices of the materials that can be modeled as a homogeneous dielectric plate with a smooth surface were estimated by the combined use of reflection and transmission data. The refractive indices of a concrete plate, plasterboard, a floorboard, and rock wool at 57.5 GHz were found to be 2.55-j0.084, 1.50-j0.01, 1.98-j0.083, and 1.26-j0.005, respectively. These indices showed little frequency dependence in the measured frequency range, except for that of the floorboard, which varied about 10%. The authors also measured the reflection characteristics of materials with inhomogeneous structures or rough surfaces, and found that the specular reflection from a concrete plate and a floorboard can be reduced significantly by covering them with carpet tiles with rough surfaces.read more
Citations
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Journal ArticleDOI
Indoor Millimeter Wave MIMO: Feasibility and Performance
TL;DR: Numerical results provide insight into the spatial variations of attainable capacity within a room, and the combinations of beamsteering and spatial multiplexing used in different scenarios are provided.
Journal ArticleDOI
Effects of antenna directivity and polarization on indoor multipath propagation characteristics at 60 GHz
TL;DR: From the results of measurements and ray-tracing simulations, the use of a directive antenna at the remote terminal is demonstrated to be an effective method of reducing the effects of multipath propagation.
Book
Measuring the Permittivity and Permeability of Lossy Materials: Solids, Liquids, Metals, Building Materials, and Negative-Index Materials
Richard G. Geyer,Chriss A. Grosvenor,Christopher L. Holloway,Michael D. Janezic,Robert T Johk,Pavel Kabos,James R. Baker-Jarvis +6 more
TL;DR: In this paper, the authors provide a comprehensive guide for researchers in the area of measurements of lossy dielectric and magnetic materials with the intent of assembhng the relevant information needed to perform and interpret Dielectric measurements on lossy materials in one place.
Journal ArticleDOI
UWB on-body radio channel modeling using ray theory and subband FDTD method
TL;DR: In this paper, the authors presented the ultra-wideband on-body radio channel modeling using a subband finite-difference time-domain (FDTD) method and a model combining the uniform geometrical theory of diffraction and ray tracing (RT).
Journal ArticleDOI
Measurements of reflection and transmission characteristics of interior structures of office building in the 60-GHz band
K. Sato,Takeshi Manabe,Toshio Ihara,H. Saito,S. Ito,T. Tanaka,K. Sugai,N. Ohmi,Yasushi Murakami,M. Shibayama,Y. Konishi,T. Kimura +11 more
TL;DR: In this paper, the reflection and transmission coefficients of typical walls, floor, ceiling, window, and partitions were measured at 57.5 GHz and compared with the reflection characteristics estimated by multilayer dielectric models.
References
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Journal ArticleDOI
Measurement of the complex refractive index of concrete at 57.5 GHz
TL;DR: In this paper, the authors measured the complex refractive index of concrete at 57.5 GHz by the combined use of free-space reflection and transmission methods and showed that the reflection coefficient of a concrete plate is less dependent on water content.
Journal ArticleDOI
AVNA-based polarimetric scatterometers
TL;DR: In this article, the polarization synthesis technique for measuring the scattering properties of point and distributed targets is discussed, and accurate measurements of both the magnitude and phase of the scattered signal are now possible by using the signal processing and error-correction techniques of the automatic vector network analyzer (AVNA).
Journal ArticleDOI
Calibration techniques for free space reflection coefficient measurements
TL;DR: In this paper, the most commonly used free space calibration procedure using an empty room and a metal plate is described, and the errors arising critically examined, and alternative calibration procedures using both two and three term error correction are investigated both theoretically and experimentally and shown to be efficacious in reducing measurement errors.